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  java 性能监控与故障处理工具
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  <h2 id="1-JDK命令工具"><a href="#1-JDK命令工具" class="headerlink" title="1.JDK命令工具"></a>1.JDK命令工具</h2><table>
<thead>
<tr>
<th align="left">名称</th>
<th align="left">主要作用</th>
</tr>
</thead>
<tbody><tr>
<td align="left">jps</td>
<td align="left">JVM Process Status Tool,显示指定系统内所有的HotSpot虚拟机进程</td>
</tr>
<tr>
<td align="left">jstat</td>
<td align="left">JVM Statistics Monitoring Tool,用于收集HotSpot虚拟机各方面的运行数据</td>
</tr>
<tr>
<td align="left">jinfo</td>
<td align="left">Configuration Info For Java ,显示虚拟机配置信息</td>
</tr>
<tr>
<td align="left">jmap</td>
<td align="left">Memory Map For Java,生成虚拟机的内存转储快照</td>
</tr>
<tr>
<td align="left">jhat</td>
<td align="left">JVM Heap Dump Browser,用于分析heapdump文件，它会建立一个Http/HTML服务器，让用户可以在浏览器上查看分析结果</td>
</tr>
<tr>
<td align="left">jstack</td>
<td align="left">Stack Trace For Java 显示虚拟机的线程快照</td>
</tr>
</tbody></table>
<h3 id="1-1-jps-虚拟机进程状态工具"><a href="#1-1-jps-虚拟机进程状态工具" class="headerlink" title="1.1 jps:虚拟机进程状态工具"></a>1.1 jps:虚拟机进程状态工具</h3><p>jps列出正在运行的虚拟机进行，并显示虚拟机执行主类名称以及这些进程的本地虚拟机唯一ID。</p>
<p>jps命令:</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">jps [option] [hostid]</span><br></pre></td></tr></table></figure>

<p>jps执行样例:<br><img src="./jps.png" alt="jps.png"></p>
<table>
<thead>
<tr>
<th align="left">选项</th>
<th align="left">作用</th>
</tr>
</thead>
<tbody><tr>
<td align="left">-q</td>
<td align="left">只输出LVMID，省略主类的名称</td>
</tr>
<tr>
<td align="left">-m</td>
<td align="left">输出虚拟机进程启动是传递给主类main()函数的参数</td>
</tr>
<tr>
<td align="left">-l</td>
<td align="left">输出主类的全名，如果进程执行的是jar包，输出jar路径</td>
</tr>
<tr>
<td align="left">-v</td>
<td align="left">输出虚拟机进程启动时JVM参数</td>
</tr>
</tbody></table>
<h3 id="1-2-jstat-虚拟机统计信息监视工具"><a href="#1-2-jstat-虚拟机统计信息监视工具" class="headerlink" title="1.2 jstat:虚拟机统计信息监视工具"></a>1.2 jstat:虚拟机统计信息监视工具</h3><p>jstat监视虚拟机各种运行状态信息的命令行工具。可以显示本地或者远程虚拟机进程中的类装载、内存、垃圾收集、JIT编译等运行数据。</p>
<p>jstat命令格式</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">jstat [option vmid [interval[s|ms][count]]]</span><br></pre></td></tr></table></figure>
<p>vmid:<br>本地：与本地VMID一致。<br>远程：格式如下<br>[protocol:][//]lvmid[@hostname[:port]/servername]</p>
<p>interval:查询间隔。<br>count：次数。</p>
<p>如果省略两个参数，说明只查询一次。</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">每250秒查询一次进行2777垃圾收集状况，一次查询20次</span><br><span class="line">jstat -gc 2777 250 20</span><br></pre></td></tr></table></figure>

<p>option:查询虚拟机信息，分为3类：类装载、垃圾收集、运行编译状况</p>
<table>
<thead>
<tr>
<th>选项</th>
<th>作用</th>
</tr>
</thead>
<tbody><tr>
<td>-class</td>
<td>监视类装载。卸载数量、总空间以及类装载所消耗的时间</td>
</tr>
<tr>
<td>-gc</td>
<td>监视java堆状况，包括Eden区、两个Survivor区、老年代、永久代等容量、已用空间、GC时间合计等信息</td>
</tr>
<tr>
<td>-gccapacity</td>
<td>监视内容与-gc基本相同，但是输出主要关注java堆各个区域使用的最大、最小空间</td>
</tr>
<tr>
<td>-gcutil</td>
<td>监视内容与-gc基本相同，但是输出主要关注已使用的空间占总空间的百分比</td>
</tr>
<tr>
<td>-gccause</td>
<td>与-gcutil功能一样，但是会额外输出导致上一次GC产生的原因</td>
</tr>
<tr>
<td>-gcnew</td>
<td>监视新生代GC状况</td>
</tr>
<tr>
<td>-gcnewcapacity</td>
<td>监视内容与-gcnew基本相同，输出主要关注使用到的最大、最小空间</td>
</tr>
<tr>
<td>-gcold</td>
<td>监视老年代GC状况</td>
</tr>
<tr>
<td>-gcoldcapacity</td>
<td>监视内容与-gcold相同，输出主要关注使用到的最大、最小空间</td>
</tr>
<tr>
<td>-gcpermcapacity</td>
<td>输出永久代使用到的最大、最小空间</td>
</tr>
<tr>
<td>-compiler</td>
<td>输出JIT编译器编译过的方法和耗时等信息</td>
</tr>
<tr>
<td>-printcompilation</td>
<td>输出已近被JIT编译方法</td>
</tr>
</tbody></table>
<h3 id="1-3-jinfo-java配置信息工具"><a href="#1-3-jinfo-java配置信息工具" class="headerlink" title="1.3 jinfo:java配置信息工具"></a>1.3 jinfo:java配置信息工具</h3><p>jinfo的作用是实时的查看和调整虚拟机各项参数</p>
<p>jinfo命令</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">jinfo [option] pid</span><br></pre></td></tr></table></figure>

<h3 id="1-4-jmap-java内存印象工具"><a href="#1-4-jmap-java内存印象工具" class="headerlink" title="1.4 jmap:java内存印象工具"></a>1.4 jmap:java内存印象工具</h3><p>jmap用于生成堆转储快照（heapdump/dump文件）。还可以查询finalize执行队列、java堆和永久代的详细信息，如空间使用率、当前用的哪种收集器等。</p>
<p>jmap命令</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">jmap [option] vmid</span><br></pre></td></tr></table></figure>
<table>
<thead>
<tr>
<th>选项</th>
<th>作用</th>
</tr>
</thead>
<tbody><tr>
<td>-dump</td>
<td>生成java堆转储快照，格式为-dump:[live,]format=b,file=&lt;filename&gt;,其中live子参数说明是否只dump出存活的对象</td>
</tr>
<tr>
<td>-finalizerinfo</td>
<td>显示在F-Queue中等待Finalizer线程执行finalize方法的对象。只在Linux/Solaris平台下有效</td>
</tr>
<tr>
<td>-heap</td>
<td>显示java堆详细信息，如使用哪种回收器、参数配置、分代状况等。只在Linux/Solaris平台下有效</td>
</tr>
<tr>
<td>-histo</td>
<td>显示堆中对象统计信息，包括类、实例数量、合计容量</td>
</tr>
<tr>
<td>-permstat</td>
<td>以ClassLoader为统计口径显示永久代内存状态。只在Linux/Solaris平台下有效</td>
</tr>
<tr>
<td>-F</td>
<td>当虚拟机进程堆-dump选项没有响应时，可以使用这个选项强制生成dump快照。只在Linux/Solaris</td>
</tr>
<tr>
<td>平台下有效</td>
<td></td>
</tr>
</tbody></table>
<h3 id="1-5-jhat-虚拟机堆转储快照分析工具"><a href="#1-5-jhat-虚拟机堆转储快照分析工具" class="headerlink" title="1.5 jhat:虚拟机堆转储快照分析工具"></a>1.5 jhat:虚拟机堆转储快照分析工具</h3><p>jhat用于生成虚拟机当前时刻快照。线程快照是当前虚拟机内每一条线程正在执行的方法堆栈的集合，生成线程快照的主要目的是定位线程出现长时间停顿的原因，如线程间死锁、死循环、请求外部资源导致的长时间等。</p>
<p>jstack命令</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">jstack [option] vmid</span><br></pre></td></tr></table></figure>

<table>
<thead>
<tr>
<th>选项</th>
<th>作用</th>
</tr>
</thead>
<tbody><tr>
<td>-F</td>
<td>当正常输出的请求不被响应时，强制输出线程堆栈</td>
</tr>
<tr>
<td>-l</td>
<td>除堆栈外，显示关于锁的附加信息</td>
</tr>
<tr>
<td>-m</td>
<td>如果调用本地方法的话，可以显示c/c++的堆栈</td>
</tr>
</tbody></table>
 
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                <button class="pswp__button pswp__button--share" style="display:none" title="Share"></button>

                <button class="pswp__button pswp__button--fs" title="Toggle fullscreen"></button>

                <button class="pswp__button pswp__button--zoom" title="Zoom in/out"></button>

                <!-- Preloader demo http://codepen.io/dimsemenov/pen/yyBWoR -->
                <!-- element will get class pswp__preloader--active when preloader is running -->
                <div class="pswp__preloader">
                    <div class="pswp__preloader__icn">
                        <div class="pswp__preloader__cut">
                            <div class="pswp__preloader__donut"></div>
                        </div>
                    </div>
                </div>
            </div>

            <div class="pswp__share-modal pswp__share-modal--hidden pswp__single-tap">
                <div class="pswp__share-tooltip"></div>
            </div>

            <button class="pswp__button pswp__button--arrow--left" title="Previous (arrow left)">
            </button>

            <button class="pswp__button pswp__button--arrow--right" title="Next (arrow right)">
            </button>

            <div class="pswp__caption">
                <div class="pswp__caption__center"></div>
            </div>

        </div>

    </div>

</div>

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/photoswipe@4.1.3/dist/photoswipe.min.css">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/photoswipe@4.1.3/dist/default-skin/default-skin.min.css">
<script src="https://cdn.jsdelivr.net/npm/photoswipe@4.1.3/dist/photoswipe.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/photoswipe@4.1.3/dist/photoswipe-ui-default.min.js"></script>

<script>
    function viewer_init() {
        let pswpElement = document.querySelectorAll('.pswp')[0];
        let $imgArr = document.querySelectorAll(('.article-entry img:not(.reward-img)'))

        $imgArr.forEach(($em, i) => {
            $em.onclick = () => {
                // slider展开状态
                // todo: 这样不好，后面改成状态
                if (document.querySelector('.left-col.show')) return
                let items = []
                $imgArr.forEach(($em2, i2) => {
                    let img = $em2.getAttribute('data-idx', i2)
                    let src = $em2.getAttribute('data-target') || $em2.getAttribute('src')
                    let title = $em2.getAttribute('alt')
                    // 获得原图尺寸
                    const image = new Image()
                    image.src = src
                    items.push({
                        src: src,
                        w: image.width || $em2.width,
                        h: image.height || $em2.height,
                        title: title
                    })
                })
                var gallery = new PhotoSwipe(pswpElement, PhotoSwipeUI_Default, items, {
                    index: parseInt(i)
                });
                gallery.init()
            }
        })
    }
    viewer_init()
</script>

<!-- MathJax -->

<!-- Katex -->

<!-- busuanzi  -->


<script src="/js/busuanzi-2.3.pure.min.js"></script>


<!-- ClickLove -->

<!-- ClickBoom1 -->

<!-- ClickBoom2 -->

<!-- CodeCopy -->


<link rel="stylesheet" href="/css/clipboard.css">

<script src="https://cdn.jsdelivr.net/npm/clipboard@2/dist/clipboard.min.js"></script>
<script>
  function wait(callback, seconds) {
    var timelag = null;
    timelag = window.setTimeout(callback, seconds);
  }
  !function (e, t, a) {
    var initCopyCode = function(){
      var copyHtml = '';
      copyHtml += '<button class="btn-copy" data-clipboard-snippet="">';
      copyHtml += '<i class="ri-file-copy-2-line"></i><span>COPY</span>';
      copyHtml += '</button>';
      $(".highlight .code pre").before(copyHtml);
      $(".article pre code").before(copyHtml);
      var clipboard = new ClipboardJS('.btn-copy', {
        target: function(trigger) {
          return trigger.nextElementSibling;
        }
      });
      clipboard.on('success', function(e) {
        let $btn = $(e.trigger);
        $btn.addClass('copied');
        let $icon = $($btn.find('i'));
        $icon.removeClass('ri-file-copy-2-line');
        $icon.addClass('ri-checkbox-circle-line');
        let $span = $($btn.find('span'));
        $span[0].innerText = 'COPIED';
        
        wait(function () { // 等待两秒钟后恢复
          $icon.removeClass('ri-checkbox-circle-line');
          $icon.addClass('ri-file-copy-2-line');
          $span[0].innerText = 'COPY';
        }, 2000);
      });
      clipboard.on('error', function(e) {
        e.clearSelection();
        let $btn = $(e.trigger);
        $btn.addClass('copy-failed');
        let $icon = $($btn.find('i'));
        $icon.removeClass('ri-file-copy-2-line');
        $icon.addClass('ri-time-line');
        let $span = $($btn.find('span'));
        $span[0].innerText = 'COPY FAILED';
        
        wait(function () { // 等待两秒钟后恢复
          $icon.removeClass('ri-time-line');
          $icon.addClass('ri-file-copy-2-line');
          $span[0].innerText = 'COPY';
        }, 2000);
      });
    }
    initCopyCode();
  }(window, document);
</script>


<!-- CanvasBackground -->


    
  </div>
</body>

</html>